Firingmissiles into tee air



E. 'BUSSEI March 15, 1932.

PROCESS AND APPARATUS FOR ASCERTAINING THE ORDNANCE DATA NECESSARY FORFIRING MISSILES INTO THE AIR 5 Sheets-Sheet 1 Filed Nov. 12, I 1950(Wocofp) I firedi'w: ji-zore Buss at I I Jffiarngg/s di'iziaw 3 E.BUSSEI 4 1 PROCESS AND APPARATUS FOR ASCERTAINING THE ORDNANCE i FORFIRING MISSILES INTO THE AIR 3 Sheets-Sheet 2 March 15, 1932.

'DATA NECESSARY Filed Nov. 12, 1930 g 155 152 a i v v G167 4 ,h i

. (es; 15 71-8) Q. V 150 V 1569159 0; 6,2 165 i Y i i v lnvelz'b'nfitoreEassez' t, I XQ Q W v jttarna s March 15, 1

PROCESS AND APPARAT E. BUSSEI DATA NECESSARY FOR FIRING MISSILES INTOwas Am l ed Nov. 12, '1930 US FOR ASCERTAINING THE ORDNANCE 3Sheets-Sheet 3 I Invenfdf;

ji-tore .Eussezl At t'arney s,

Patented Mar. 15, 1932 "warren stares PATENT omen nr'ronn BUSSEI, orrnonnncn rery, ASSIGNOR TO OFFICINE LQMBARDE srrnnzaccm DI ranors'rouno. L. A. r. seamen momma, or MILAN, ITALY PROCESS AND PARATUS FORASCERTAIN IN G THE ORDNANCE DATA NECESSARY FOR I p FIRING IMISSILES INTOTHE AIR A Application filed November 12,1930, Serial no. 495,136; and.in Italy July 29,1929 f The invention relates to a process and apparatusfor ascertaining the ordnance data necessary for firing'missiles intothe air.

Control apparatus for mechanically directing; anti-aircraftthe are knownwhich give the path of the object aimed at in order to obtain indicationof necessary data for the firing of the missile; also such apparatuswhichusethe chord of the projectile path (chartdistance) or calculatethe required values by means of calculating mechanisms according to a 1determined formula either mechanically or electromagnetically. It isassumed in most cases that the object aimed at is flying in a straighthorizontal path because consideration of the variations of height ininclined flight would considerably complicate the calculating device.

\Vith the help of mechanical and optical calculating devices the presentinvention solves the problem even for general cases of inclined flightwhereby the only assumption made is that the speed of the object aimedat remains constant in velocity and direction from the momentthe shot isfired until itvhits the object aimed at. This is obtained according tothe invention in that on the basis of values obtained by constantobservation of the object aimed at, first the plane including thedirection or line of flight and the spot ting or observation.point isdetermined, then the position of the path of flight of the objectaim'edat said object being constantly 'in the first plane, as also theposition of the path of the'missrle in this plane and finally iron thesedeterminations, the components corresponding to the angular displacementof the gun are obtained by optically mechanical means. I I p One form ofconstruction of the invention is shown by way of example in thedrawings, in which:

The position of the path of the object aimed at and the data fordetermining its Figure l.

magnitude is shown diagrammatically in Figure 2 is a partly diagrammaticshowing 7 of a device for ascertaining the position of the plane offlight and of theangularvelocitv.

Figure 3 shows diagrammatically a device for continuallyascertaining bygraphical means the angle of intersection between the path of the objectaimed at and the direct on of the sa ine,

' Figure i shows diagrammatically a device for ascertaining the velocityof the object aimed at from its diagonal components and from itsdirection. 1

Figure 5 IS a partly diagrammatic showing 7 the point of impact on thispath of the missile.

Fig. 6a is a top plan view of one form of construction of a mechanismfor the optical mechanical conversion of the projection intersec'tinqthe plane of flight into the angle values corresponding to the movementsof the gun. I

Figures and G0 are'cross sections on the lines AA and BB respectively ofFigure 6a. In Figure 1, O is the place of discharge that is to say thespotting point, for instance the place where the gun is situated, \VP Pis the path of flight, OlYP P the plane of flight, O]? P the plane ofthe object aimed at; X the point of intersection of the perpendicula: Kfrom O to the path of the target; K the shortest range, P the momentaryposition of the object aimed at, w the corresponding range, P the pointof contact, a the respec- 1 momentary direction of the same from the fangun or point of observation.

' If we represent the horizontal and vertical angle velocities of thepath of the object aimed at by W WV and its angle velocity in the planeof flight by W nnd further the angle of inclination of vthe plane offlight towards the plane of the object aimedat by PD a mathematicalcalculation results in:

I tan p The angle .p and therefore thepositionythe plane of flight withregard to the momentary i direct-ion ofthe object aimed at andthe'angular velocity in the plane of flight are deter mined by means of-W VA and e 7 c The velocity =P Q of the object aimed at has the twocomponents HQ, in the plane of flight, in the direction of the line ofsight of 'with the direction of the velocity.

the object aimed at and equal to the unit variation of range i of theobject aimed at, and POR=U diagonally to the direction of the objectaimed at and equal to the product of the angular velocity my and therange T his second cornponent forms the angle QP R= =-fi,, l9 1O valueof to be determined from the successive range values and the product (WK.00 obtainable from the measured range w and the angular velocity mywould make it possible therefore to ascertain the velocity 'v of theobject aimed at in value and direction.

If the value p rlt 7 cannot be obtained with sufficient accuracy fromthe range measurements, the velocity can according to this invention, bealso determined from the components '0 or w na, and from the angle. QPgRy (or'fifi whilst the angular velocity lV is ascertained separately withthe help of the angle velocities. By mathematical calculations itisfound'that the tangent to the curve which is obtained if the reciprocalvalue is entered in the function of time t in a rightangled co-ordinatesystem forms an angle y corresponding to the angle between the tangentto the curve at themomentaryposition of the object and the direction ofthe g axis. In determining the velocity 'v of the object aimed at from11 and Y0 the value is obtained in addition. v

The right angled triangle OlVP gives the distance K and the path offlight WP can be obtained by means of the angle 7 and the range m 'tothe point of the object aimed at at the given moment. The duration pointof intersection VF to the place of the object aimed at P is also knownby the fly- #5 'ing tract P as a has already been ascertained. If theduration of the flight of the object aimed at from W to the pointP is.

equal to t then P P =w (t -t and if P is the point of contact then thedifference in time (fig-t is equal to the time of flight T- of the shotaccording to the shot table for the range ai ==OP and the angle P 0P =y7 is qual to the value A 'y in the plane of flight.

which i t of the flight of the object aimed at from the The telescopesare adjusted hori 8 and is adjusted in relation toithis gear by thecrank 6. The setting of the crank 6 thus represents the horizontal anglevelocity V -of the object while the arrangement T, Sapplies continuallyto the telescopes the integral of said angle velocity. In the same way,the telescopes are &Cl]1lSlTfCl vertically on the object by the crank 9through the diiferential 10. The adjustment is then preserved throughthe friction Wheel 13 driven by the large wheel 14: and adjusted acrossthe face of this 'wheel by the crank 12, thus giving the verticalanglevelocity lVv While applying the actual angular change to the telescopes.The

horizontal angle velocity is applied to a V cosine multiplicationarrangement 1.5 of any well known type such as that shown in the patentto Kaminski h'o. 152G551, the method of operation of which is notdescribed in detail here, which on the other side is influenced by theangular rotation of the hollow shaft 11 of two telescopes through theshaft 5 and therefore the vertex angle s for the object aimed at isapplied to the device 15 which constantly gives the product (1. cos eThis latter lsapplied to the actual mechanism for ascertaining p and bya carriage 16 which is displaced by a screw arrangcment on the shaft.(li cos i from the centre of the disc 21 proportionately to this value.A second carriage 17 is displaced vertically to the direction of motionof this car riage proportionally to the vertical angular velocity W (bya similarscrew arrangement). Each of the two carriages has a slotarranged transversely to its direction of motion. These two slots guidea pin 18 which according to the above formulae provides theend point ofthe vector of the angular velocity -Wy in the plane of flight.

obtained by the wheels 22 and the shaft 23.

The radial displacement of the rack 19 proportionally to 'lVy is takenup by thespur gear and bevel wheel 20 and is transmitted to the returndifferential 24; by which through gear connection to the shaft 23 theinfluence of the rotation of the disc on \V is compensated in knownmanner; the shaft 25 gives the value lVy.

In order to beable to eliminate variations in the adjustment of; the endpoint of the vector. 7 caused by mechanical errors or errors inmeasuring, this end point can be shown if-necessary in the mechanismaccord- I ing to Figure 2, by the point of intersection of two threads'carried b'y the carriages 16 and j ustn ent of the carriage does notdirectly influence the further members provided for calculating thevaluesbut a marking is maintained in coincidence with that point ofintersection in such a way that it does not follow the smallervariations in the adjustment I of the point of intersection of thethread caused accidentally. One form of construction of the mechanismfor continuously ascertaining the angle of intersection between the pathof the object aimed at and the momentary direction of the same from thegun or point of observation is shown in Figure 3. The value derived fromthe shaft25 of Figure 2 is applied tofa cam cylinder which translatesthe rotation of the cylinder proportional to N into a displacement ofthe rack 36proportional to by means of a corresponding cam groove and.

" places the nut 39 provided with a marking pin 40. A marking hand allis displaced with uniform velocity perpendicularly to the direction ofmotion of the spindle nut 39 for example by a clock-work 42. The markingpin 40 then traces a curve 28 which represents the curve of the abovementioned function For ascertaining the inclination of the tan- 1?instead of a pin guided by slots. The ad gent to this curve atransparent ruler 48 is provided which can be so displaced and rotatedabout'its axis that it passes through the last marked point of thecurve,v which, considered mathematically, constitutes a parabola andimmediately assumes thedirection of the tangents to this point.

The axis of rotation of the ruler is disposed on a carriage at? whichcan be displaced perpendicularly to the direction of motion of themarking band by the crank by means of the spindle 46. The ruler at thesame time can be'rotated by the crank through the wheels 56,differential 54, shaft 53 andfurther through the gear wheel 52 disposedon the carriage 47 and longitudinally displaceable on the shaft as wellas through the gear wheel 51worm 50 and worm wheel segment -19. Theangle of rotation of the ruler with regard to the direction of motion ofthe marking band results in the angle 70 which is derived from the shaft57. v

The following mechanism is provided for continuously ascertaining theangle 70 from one single adjustment of direction of the ruler 48 -Therotation proportional to is transmitted from the shaft 25 to a frictiongearing integrator 59, the friction wheel 58 of which is displacedby ascrew arrangement proportionally to lV so that the integratorcontinually forms the integral fV-yilt in known manner; which isalgebraically added through 60 in the differential 54: to the initialvalue. of the angle adjusted by the crank 55. I

In Figure 4t a multiplication arrangement 61 of suit-able construction(for instance, of the type shown in the patents to Meitner, 1,38 5,551;Barr) 1,493,095; Kaminski, 139K512; or Gaedke,1,788,996) continuallygives the product o =l'Vy.as. fromthe values lVy and an. A carriage 62is displaced by a screw arrangement from the middle point of a disc? 2proportionally to this component of o. The carriage 62 supports aspindle 63, the nut 64 of which can be; displaced by the shaft 67through bevel wheels perpendicularly to the direction of motion of thecar -r1age 62 therefore corresponding to the direction of the component7 of 'v. A peg 65 of the nut 64 engages through a groove in the carriage(32 with a rack 70 radially displaceable on the disc 72. A dis placementof the carriage 62 or of the nut 6% effects a rotation-of the disc 72inaddition to a radial. displacement of the rack 70. I

A wormwheel (0 is. rotated by the worm 74 of the shaft 57 and carriesthe counter contact of a contact arrangement 69, the middle contact ofwhich is secured to the disc 72.

The contact arrangement operates for exam-- ple a small electric motor68 in such a way 139 that it rotates the shaft 67 in the correspondingdirection and therefore displaces the nut 64 until the rotation of thedisc 7 2, effected by the displacement of the carriage (32, isproportional to (lV w and the displacement portional to the component i2 (la;

This rotation is transmitted to the friction roller 88 of the integrator89 which forms the integral tit and is applied to the differential 83where it is algebraically added to an initial value of the rangeestimated, measured or adjusted by means of the crank 85 so that thedifferential 83 then continually gives the distance as, of the missile.i v

I will be obvious from the above that when the original range {/10 hasbeen set by the crank 82, the further changes in range will betransmitted to the shafts and 57. Any changes in either of thesequantities will again cause contact at' 69 and will cause the motor tochange the position of the point B until it is set at the proper range.In this way, after the original range has once been set, the properrange will always be maintained on the shaft ar merely by following theobject with the telescopes.

In Figure 5 a spindle 10-lis disposed on a disc 103 and is adjusted inthe direction of the vector of the momentary range of the missile by theworm wheel 102 connected to the disc which is rotated by the shaft 57away from a definite direction corresoonding to the shortest distance ofthe object aimed at, so that the angle between the spindle 101 and thesaid definite direction equals the angle The nut 108 is displaced on thespindle through the return differential 105, bevel -wheels 100 and 107proportionally to 1a,.

The pin of the spindle nut 108 which provides the end point of thevector of the momentary range moves the two carriages 100 and 111displaceable perpendicularly to ach other, during its adjustment. Thecarriage 111 is displaced in the definite direction mentioned by anamount which is proportional to the length K of the perpendicular fromtho spotting or observation point, for instance, the gun, which isrepresented. by the middle point of the disc 103, to the path ofthetarget, whilst the displacement of the second carriage 109perpendicularly thereto is proportional to the distance (on) of themoinentary position of the target from the point of intersection lV ofthis perpendicular. The carriage 111 carries a spindle 112 transverse toits direction of motion, which spindle is displaced thereforetransversely by the movement of the carriage by the amount K from themiddle point of this disc 123, the point corresponding to the discharge(observation) point. A nut 113 corresponding to the point of contact canbe displaced onthis spindle 112 representing the path of 1 the target bya motor 110 through the shaft 115 and bevel wheels 114. A pin on the nut113 engages in a rack 121 on the disc 123 and effects a rotation of thedisc 123 in addition to displacement of this racl: during thedisplacement of the spindle nut. The angle of rotation is supplied to adili'erential 121 which on the other hand is rotated by the angle ofrotation of the disc 10? and forms the difference of these two angleswhich is ap alied to a device 13 described with reference to Figures 6a,6b and G0.

The rotation ot-the shaft 115 proportional to the displacement ('06 ofthe spindle nut 11?} is transmitted to a differential 117 which I on theother hand receives the displacement (et of the *arriage 109 by thewheel 110 and forms the difference o (6 :1 This value is given to adivisional arrangement 118 of suitable construction (for instance, ofthe type shown in the patents to Meitner, 193i i; Barr, 1,493,095;Kaininshi,

2; or Gaedlre, 1,788,096) which in addition obtains thevalue '2; andgives the value (t -t This is transmitted to a differential 138, thecentre wheels of which operate a contact device 139 which controls themotor 110. The distance of the spindle nut 113 representing. the pointof contactfrom the centre point of the disc 12-3 corresponding to thepoint of discharge is supplied as a displacement of the rack 12-1:through spur gear and bevel wheels 12.7, return differential 12f; andspindle 127 which displaces a carriage 12S proportioin'dly to thisdistance m A rack 129 displaceable perpendicularly to the direction ofmotion on the carriage in a guide of this carriage. A displacement ofthe rack is effected by a small roller 15.) which abuts against a camelement 33 formed in correspondence with the function of the flightaccording to the gun tabl from the of the flight of the shot belongingto the range m taking into consideration the vertex angle,

of the contact point. This displacement is taken up by the gear wheel130 which is mounted on the'carriage 128 and displaceable on the shaft133 and is transmitted by the shaft 131 to the differential 138.

As long as the movements of rotation of the shafts 131* and 137 aredifferent, the contact mechanism 139 switches the motor 140 i 1 Thesighting telescope 150 (Figure 6a) is 'the'difi'erence between the angleof rotation of the discs formed by the differential 121 corresponds tothe value A in the plane of flight.

rotated as a whole continually'through the vertex angle s by the shaft151 and worm gearing 152 about the horizontalaxis a,a

passing through the point of intersection U: of the twoaxes ofrotatio'nof the head prism 154. A segmental yoke 118 is provided which isrotatable about a radius of the segment as an axis, that'is, about theline BB in Figure 6a. This yoke carries a member142. whichis slidablelongitudinally or about the center oi the segment. This member 142carries a mark or marking 143.

tical axis of rotation mm of the-head prism of the telescope is thus setat an angle of 90 to the horizontal axis of rotation of: the circularyoke 116. Two adjusting move ments for aligning a mark displaced on. theyoke by the amount A are given to the head prism 104 by means of thecranks 167 and 163.

'; The prism with the head part 153 is rotated by means of the crank 167about the axis m--m through return differential 166-bevel wheel 165bevelwheel segment 164, which is securcd to the head part 155;. through thelateral angle A 5 (that is the projection ona horizontal plane of theangle A and by means of the crank 163 about the axis c cy through returndifferential 162 and 161' spur gear wheels 160-bevel vwheel segments159bevel wheel segment 158. which is loosely rotatable about the headpart 153-spur gear wheel segment 1.57 which is connected to 15S.-spurgear wheel 156. the shaft of which is disposed on the head part 1uandbevel Wheels 155 through the vertex angle a. forthe point of contact. Ifitis; necessary to transmit the vertex angle to the gun, the rotation isgiven to a ditlierential which on the other hand receives the angle 5.,and continuallv forms the difference As.

The mechanism for adjusting the mark corresponding to the point ofcontact consists The originally verof the circular yoke 116 which isrotated about I its axis of rotation 'MP. by the shaft 141 through theangle pO towards the (vertical) position. The yoke 116 forms the guidefor a sliding member 142 which carries the mark 143 corresponding to thepoint of contact; For adjusting the angle A7 the sliding memher is"correspondingly displaced by the worm gearing 149 through returndifierential 148- spur gear wheel 147--spur gear wheel 146,

which is loosely rotatable about the shaft 141,

as well as through spur gear wheel 145- gear wheel 144 and toothedgearing on the sliding member.

The rotations of the cranks 163 and 167 are proportional to es and Aqband can be transmitted in known manner to the guns. The

other ordnance data such as the top angle.

and timing of the gun can also be determined to known manner from thedetermining members for the point of contact and can be applied to theguns. I

In conclusion it is to be'remarked that the mechanisms shown as separatein the drawings' for thesake of clearness are in practice best combinedin one single apparatus which is therefore used as. a central regulatingarrangementfor directing fire. This is indi-v cated in the drawings byusing the same numorals in the figures for identical elements.

I clalm: 1.. In a tire control arrangement, means for ascertaining-thereciprocal value of twice the angular velocity of the object aimed at inthe plane of flight with relation to the time, and a mechanical-memberadjustable to represent the tangent to the curve corresponding to suchreciprocal value at the point corresponding to the momentary position ofthe object aimed at, the angular position of said adj ustable memberbeing proportional to the angle of intersection between a perpendicularfrom the point of observation to the path of the object aimed at and theline from the point of i observation to the momentary position of the lobject in said path.

2. In a fire control the angular velocity of the object aimed at in theplane of flight with relation to the time, a mechanical memberadjustable to rep-- resent the tangent to the curve corresponding tosuch reciprocal value at the point correspondingto the momentaryposition of the object aimed at. the angular position of said adjustablemember being proportional to the arrangement, means for ascertainmg thereciprocal value of twice angle of intersection between a perpendicularfrom the point of observation to the path of the object aimed at andthelinefrom the point of observation to the momentary position of theobject in said path. and means for integrating the angular velocity withrespect to the time whereby said angle of intersection is automaticallyascertained during movement of the object.

3. In a fire control arrangement, means for ascertaining the reciprocalvalue of twice the angular velocity of the object aimed at in the planeof flight with relation to the time, a mechanical member adjustable torepresent the tangent to the curve corresponding to such reciprocalvalue at the point corresponding to the momentary position of the objectaimed at, the angular positionof said adjustable member beingproportional to the angle of intersection between a perpendicular fromthe point of observation to the path of the object aimed at and the linefrom the point of observation tot-he momentary position of the object insaid path, and means for integrating the angular velocity with respectto the time and for adding said integral algebraically to the said angleof intersection, whereby the said angle. of intersection is automatically and continuously ascertained during movement of the object.

4. In a fire control arrangement, a disc, means for rotating said discthrough an angle equal to the angle of intersection between aperpendicular from the observation point to the path of the object aimedat and the line from the point of observation to the momentary positionof the object in that path, said means comprising means for ascertainingthe reciprocal value of twice the angular velocity of the object aimedat in the plane of flight with relation to the time, and a mechanicalmember adjustable to represent the tangent to the curve corresponding tosuch reciprocal value at the point corresponding to the momentaryposition of the object aimed at, a carriage displaceable transversely tothe axis of said disc, a coupling member connecting said carriage andsaid disc, the component of the distance from the point of connection ofthe coupling member and carriage to the axis of the disc in a directiontransverse to the movement of the carriage being proportional to thechange in the range to the object aimed at, the distance from said lastpoint to the axis of the disc being proportional to the velocity of theobject aimed at.

5. In a'fire control arrangement, a disc, means for rotating said discthrough an angle equal to the angle of intersection between aperpendicular from the observation point to the path of the object aimedat and the line from the point of observation to the momentary positionof the object in that path, said means comprising means for ascertainingthe reciprocal value of twice the angular velocity of the object aimedat in the plane of flight with relation to the time, and a mechanicalmember adjustable to represent the tangent to the curve corresponding tosuch reciprocal value at the point corresponding to the momentaryposition of the object aimed at, a carriage displaceable transversely tothe axis of said disc, a coupling member connecting said carriage andsaid disc, the component of the distance from the point of connection ofthe coupling member and carriage to the axis of the disc in a directiontransverse to the movement of the carriage being proportional to thechange in the range to the obj eet aimed at, the distance from saidlasttpoint to the axis of the disc being proportional to the velocity ofthe object aimed at, means for moving said carriage by distancesproportional to the component of the velocity of the object aimed attransverse to the line from the point of observation to the object, andmeans for integrating the said change in range and for adding it to theinitial range whereby the range at any moment is automaticallyascertained.

6. In a fire control arrangement, a pair of slotted guides movable indirections perpendicular to one another, a member movable in a planesubstantially parallel to the common plane of movement of said guidesand having means engaging the slots in the guides, means for turningsaid member through an angle equal to the angle between a perpendicularfrom the observation point to the path of the object aimed at and a linefrom the observation pointto the momentary position of the object inthat path, means for moving said engaging means by a distanceproportional to the range to the momentary position of the object,whereby the movement of one of said guides by said engaging meansrepresents the length of the perpendicular to the path while themovement of the second guide represents the distance from theintersection of said perpenv dicular-with said path to the momentaryposition of the object, an element connected to said first guide andmovable therewith in parallel relation thereto, a member mounted on saidelement and movable thereon in a direction perpendicular to thedirection of movement of said first guide, means for moving said memberincluding means controlled by the difference between the times of flightof the object from the point of intersection of the perpendicular withthe path of the object to the momentary position of the object and tothe point of intersection of the path of the missile withthe path of theobject. the movement of said member in excess of the movement of saidsecond guide being proportional to the gun table value of the time offlight of the missile to said last point of intersection and meanscontrolled by movement of said movable element and member forautomatically determining the range to said last point. i

7. In a fire control arrangement, a telescope, means for turning saidtelescope in horizontal and vertical planes to follow theobject aimedat, means for integrating the movements of said telescopes to give thehorizontal and vertical angle velocities of the object, means formultiplying the said horizontal angle velocity by the cosine of theangle of inclination of the momentary position of the object, means fordividing the product of said multiplication by said vertical angle.velocity-to obtain the tangent of the angle between the plane of flightand the plane ofthe object, and means for converting said tangent intothe rotation of a shaftby an amount equal to said last angle. 77

S. In a fire control arrangement, a tele scope, means for turning saidtelescope in horizontal and vertical planes to follow the object aimedat, means for integrating the movements of said telescopes to give the Ihorizontal and vertical angle velocities of 'the object, means formultiplying the said horizontal angle velocity by the cosine ofthe angleof inclination of the momentary position of the. object, means fordividing the product of said multiplication by said vertical anglevelocity to obtain the tangent ot the angle between the plane of flightand the plane of the object, and means for convert ing said tangent intothe rotation of a shaft by an amount equal to said last angle, to getherwith means-to add the squares of the said product and vertical anglevelocity, and

' flight and the second angle between the plane of the object and theplane of flight, means for finding the third angle between theperpendicular to the path of the object and the line to themomentary'position oftheobject including means to represent the curve ofthe reciprocal value of twice the angle velocity in the plane of flightand the tangent to said curve, means for multiplying the range by theangle velocity in the plane of flight to determine the transverse vectorvelocity in the plane of flight, means for combining said vectorvelocity with said third angle to find the variation in range, means'to'constantly integrate said variation in range to obtain the range, meansto combine said vector .velocity and said change in range to find thevelocity, and means to combine the velocity, the range,

and the third angle including a member graduated according to the rangetable functions of the time of flight of the missile to obtain the timeof flight of the missile and the range to the pointof intersection ofthe path of the missile with the path of the object.

In witness whereof I have hereunto set my signature.

. ETTORE BUSSEI.

